Rafter Calculator: Roof Pitch

Rafter Calculator makes roof framing calculations faster and easier. Calculate rafter length, roof pitch, rise, run, slope, overhang, birdsmouth cuts, plumb cuts, seat cuts and framing angles with clear results and interactive roof diagrams. Designed for carpenters, roofers, framers, builders and DIY projects, this rafter calculator helps you plan common roof layouts without repeatedly working through manual formulas. Whether you're building a shed, garage, porch, cabin or gable roof, enter the measurements you know and let the app calculate the rest. 🏠 RAFTER & ROOF CALCULATOR Calculate the measurements needed for common roof framing projects. Use different input combinations depending on the information available on the job. Supported calculation methods include: • Span + Pitch • Rise + Run • Angle + Run • Span + Rise Quickly calculate rafter length, roof pitch, roof angle, rise, run and roof slope from your measurements. 📐 COMPLETE RAFTER RESULTS Get important rafter measurements together in one place, including: • Total rafter length • Rafter line length • Roof pitch angle • Roof slope percentage • Horizontal run • Vertical rise • Ridge height information • Rafter multiplier • Roof overhang • Plumb cut angle • Seat cut angle • Birdsmouth depth • Seat length • Heel cut measurements Instead of switching between multiple construction calculators, review the key roof framing measurements from one calculation. 🪚 BIRDSMOUTH & RAFTER CUT CALCULATOR Planning rafter cuts can be one of the most difficult parts of roof framing. The app provides detailed information for birdsmouth cuts, seat cuts and plumb cuts, helping you inspect the joint before building. Use the close-up joint view to better understand: • Birdsmouth position • Birdsmouth depth • Seat cut angle • Plumb cut angle • Seat length • Heel cut This makes the app useful as both a rafter calculator and rafter cut calculator for everyday framing work. 📊 INTERACTIVE ROOF DIAGRAMS Roof calculations are easier to understand when you can see them. Interactive diagrams visualize your roof dimensions, rafter line, pitch, rise, run and overhang. Explore the roof layout and inspect measurements directly on the diagram. Switch between different visualization modes including side view, clean view and joint view. Supported roof layouts include: • Gable roofs • Lean-to / single-slope roofs Use the clean roof diagram when you want a simple visual for screenshots, project notes or sharing. 📏 IMPERIAL & METRIC UNITS Work using the measurement system that fits your project. Choose between: • Imperial – feet and inches • Metric – millimeters and meters Imperial users can also choose fraction precision such as 1/2, 1/4, 1/8 or 1/16 inch for practical jobsite measurements. 💾 SAVE YOUR ROOF PROJECTS Save calculations and return to them later. Keep different garage, shed, porch, gable and lean-to projects organized without entering the same measurements again. Load a saved project whenever you need to review or adjust the calculation. ⚙️ CUSTOMIZE YOUR CALCULATOR Configure the rafter calculator to match the way you work. Adjust measurement units, fraction precision, default on-center spacing and appearance. Choose light, dark or system theme preferences for a comfortable experience. 📖 BUILT-IN ROOFING GLOSSARY New to roof framing terminology? The built-in glossary explains common terms including: • Rafter • Common rafter • Run • Rise • Span • Roof pitch • Overhang It's a quick reference for understanding the measurements used throughout the calculator. 👷 BUILT FOR REAL ROOF FRAMING PROJECTS Rafter Calculator is useful for: • Carpenters • Roofers • Framers • Construction workers • Builders • Woodworkers • Contractors • DIY home projects • Shed and garage construction Download Rafter Calculator and make roof framing calculations simpler, faster and easier to visualize.

New Release Calculate rafter length, roof pitch, rise, run, slope, and overhang. Get plumb cut, seat cut, birdsmouth depth, heel cut, and framing angles. View interactive roof diagrams for gable and lean-to layouts. Save and reload roof projects for later. Supports imperial and metric measurements. Includes adjustable fraction precision, themes, defaults, and a built-in roofing glossary. Designed for carpenters, roofers, framers, builders, and DIY projects.